Mill for reduction



(No Model.)

B. P. BAUGH. Mill for Reduction.

No. 233,833. Patented Nov. 2, 1880.

UNITED STATES PATENT @rrrcn.

EDWIN P. BAUGH, OF PHILADELPHIA, PENNSYLVANIA.

MILL FOR REDUCTION.

SPECIFICATION forming part of Letters Patent No. 233,833, dated November 2, 1880. Application filed July 1, 1880. (No model.)

To all whom it may concern Be it known that I, EDWIN P. BAUGH, of the city and county of Philadelphia, and State of Pennsylvania, have invented an Improvement in Mills, of which the following is a specification.

My invention relates to the grinding or holding plates in crushing and grinding mills in general, but more particularly to those mills designed to grind ores of a silicious natureas quartz; and my invention consists in formin g the plates either linlsections or in one piece and providing such plates, both the stationary and movable parts thereof, with de- I 5 pressions, sinks, or openings in the face, in which pieces of the silicious ore or quartz lodge, and during the movement of one plate before the other such quartz or ore is]fground by one piece rubbing or grating upon another,

zo botll being held by their respective holdingplates, as hereinafter set forth, and without the usual wear upon the grinding-plates due to the work of crushing the ore by iron teeth or projections forming part of such plates.

My invention is particularly applicable to the sectional mill, a patent for which was granted to me April 30, 1867.

Heretofore it has been the practice in mills having a rotary movement to hate the grind- 0 ing-plates provided with teeth or projections of iron, as shown at I in Figure 2, which teeth split and crushed the ore to the requisite size; but in practice it is found that when a silicious ore or quartz is to be ground the iron 3 5 cannot resist the wear for any length of time, and numerous changes of the plates become necessary to keepfthe mill in good order.

The object of my invention is to provide grinding-plates particularly adapted to these hard brittle silicious ores, which shall cause the ore to be crushed or ground more satisfactorily, and which shall withstand the wear and overcome all the objectionable features of the old toothed grinding-plates.

In the drawings, Fig. l is a perspective view of one section of the moving holdingplates. Fig. 2 is an enlarged sectional view of a mill, showing stationary and moving holding-plates and method of grinding.

A is the moving holding-plate, and is secured to a rotating cone, E, carried upon a vertical spindle, F. B is the stationary holding-plate, and is secured to the body of the mill G, and just exterior to the holding-plate A. H is the usual upper grinding-1' late, and is pro vided with teeth I.

The plates A and B may be in sections, as shown in Fig. 1, or each may be made conical and in one piece, and are provided, respectively, with series of depressions or holes 0 and D of any desired shape, the larger be ing at the top or feeding end, and smaller at the bottom or discharging end. These depressions O and D may be placed upon the plates in regular or irregular order.

The operation of the holding-plates is as follows: The silicious or other ore is fed into the mill and broken up by any of the usual means, being crushed by the breakers and teeth I. It is then small enough to be fed between the plates A and B, and pieces of ore lodge in the openings or depressions U and D and are held there. As the plate A rotates or moves before the plate B, the edges of the silicious ore projecting from the depressions in both plates rub or grate upon each other, thereby crushing themselves to such an extent that they are capable of passing farther down to the next smaller depressions O and D, where they undergo the same disintegrating process over again, and so on until they are small enough to be discharged. From this it is seen, first, that the ore is made to grind or crush itself, and without the use of auxiliary teeth, second, that very little wear comes upon the holding-plate; and, third, that the holdingplate is always effective until the depressions or sinks are completely worn out, or, in other words, until the metal about the depressions or holes is worn away.

I do not confine myself to any particular shape of holding-plates, as they may vary to fit the diiferent mills in use, that shown being for what is known to the public as an E. P. Baugh No.1 Crusher, and substantially shown in applicants Reissue Patent No. 2,577 of 1867.

Having now described my invention, What I claim as new, and desire to secure by Letters Patent, is-

l. Animproved means for reducing silicious and other ores, consisting of a smooth holding plate 'or surface of homogeneous material prohaving polygonally-bounded walls, in combination with means for carrying the m aterial to be treated past said plate in such a manner that the material held by said plate sh all grind upon the material carried past it.

3. An improved means for reducing silioious and other ores, consisting oftWo smooth plates or surfaces, one of which moves before the other, both being provided with holes or sinks having polygonally-bounded Walls, for the purpose of holding the ores and carrying them in such a manner that material will grind or crush material.

4. Animproved means for reducing silicious and other ores, consisting of the frame Gr, provided internally With'sections of smooth holding-plates B, of homogeneous material, and provided with holes or sinks having polygonally-bounded Walls, in combination with a spindle, F, carrying a cone, E, and moving plates A of smooth homogeneous material, and provided with holes or sinks having polygonally-bounded walls, substantially as shown and described.

In testimony of which invention I hereunto set my hand.

EDWIN P. BAUGH.

Vitnesses Guns. J OHNSON, J r., J. P. MOORE. 

